<template>
  <!-- 商品分类导航 -->
  <div class="type-nav" @mouseleave="currentIndex=-2">
    <div class="container" @mouseenter="currentIndex=-1" @mouseleave="leaveAll">
      <h2 class="all" @mouseenter="enterAll">全部商品分类</h2>
      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
      <transition name="sort">
        <div class="sort" v-show="showCategory">
          <div class="all-sort-list2" @click="toSearch">
            <!-- 一级 -->
            <div class="item" @mouseenter="enter(index)" :class="{showlist:currentIndex===index}" v-for="(item1,index) in categoryList" :key="item1.categoryId">
              <h3>
                <a href="JavaScript:;" :data-id1='item1.categoryId' :data-name="item1.categoryName">{{item1.categoryName}}</a>
              </h3>
              <div class="item-list clearfix">
                <div class="subitem">
                  <!-- 二级 -->
                  <dl class="fore" v-for="item2 in item1.categoryChild" :key="item2.categoryId">
                    <dt>
                      <a href="JavaScript:;" :data-id2="item2.categoryId" :data-name="item2.categoryName">{{item2.categoryName}}</a>
                    </dt>
                    <dd>
                      <!-- 三级 -->
                      <em v-for="item3 in item2.categoryChild" :key="item3.categoryId">
                        <a href="JavaScript:;" :data-id3="item3.categoryId" :data-name="item3.categoryName">{{item3.categoryName}}</a>
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </div>
      </transition>
    </div>
  </div>
</template>

<script>
import throttle from "lodash/throttle.js"
import {mapState} from "vuex"
export default {
  name: "typenav",
  data(){
    return {
      currentIndex:-2,
      showCategory:this.$route.meta.showCategory
    }
  },
  computed:{
    ...mapState({
      categoryList:state=>state.home.categoryList
    }),
    ...mapState(['keyword'])
  },
  methods:{
    // 二三级隐藏，节流
    enter:throttle(function(index){
      if(this.currentIndex>-2)
        this.currentIndex=index
    },80),
    toSearch(e){
      let {id1,id2,id3,name:categoryName} = e.target.dataset
      // 需要合并params(否则：先点击搜索，再点击分类，会将搜索覆盖)
      const options = {
        name:"search",
        query:{},
        params:{},
        hash:`#${Date.now()}`
      }
      // 1- 去掉没有属性值的属性，否则，如果params中的某个属性没有属性值，url就会对应不上路由组件
      // 2- params有值才需要添加
      let params = this.$route.params
      for(let key in params){
        if(!params[key])
          delete params[key]
      }

      if(Object.keys(params).length>0){
        options.params=params
      }
      id1?options.query.id1=id1:""
      id2?options.query.id2=id2:""
      id3?options.query.id3=id3:""
      categoryName?options.query.categoryName=categoryName:""

      if(this.$route.name==="search"){
        this.leaveAll()
      }

      // 跳转之前，对比keyword，同步变化
      // let keyword = params.keyword
      // if(keyword !== this.keyword){
      //   console.log("00");
      //   options.params.keyword = this.keyword
      // }
      this.keyword?options.params.keyword=this.keyword:''
      this.$router.push(options)
    },
    // 一级显示与隐藏
    enterAll(){
      if(this.$route.name!=='home')
        this.showCategory=true
    },
    leaveAll(){
      if(this.$route.name!=='home')
        this.showCategory=false
    }
  }
};
</script>

<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    display: flex;
    position: relative;

    .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }

    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;

      .all-sort-list2 {
        .item {
          h3 {
            line-height: 29px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            margin: 0;

            a {
              color: #333;
              // background: skyblue;
              display: block;
              padding: 0 20px;
            }
          }

          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;

            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;

              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;

                &.fore {
                  border-top: 0;
                }

                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &.showlist {
            background-color: pink;
            .item-list {
              display: block;
            }
          }
        }
      }
    }
  }
}
</style>